Liquid pump



Patented Au 2,4927.

, 1.637.669 PATENT OFFICE.

UNITED STATES HUGE wA'LLAcE, or DAYTON, 01110, ASSIGNOR T GENERAL Morons RESEARCH con- I'OBATION; or DAYTON, omo, A CORPORATION or DELAWARE.-

LIQUID PUMP.

Application filed August 28, .1925. Serial No. 53,i4s.

. This invention relates to liquid pumps and particularly to liquid fuel pumps for internal combustion engines. One of the objects of the present invention is to improve the 1? construction of liquid pumps and reduce the cost of manufacture thereof. In order to accomplish this object the present invention comprises a frame which is adaptedto be attached to the engine. or other machines which operate a pump, the frame providing a pulsating chamber and a liquid outlet.

A pulsator driven by the engine reciprocates within the chamber and 'tends alternately to compress and rarefy the air therein thereby causing fuelto flow from the pump inlet to the pulsating chamber and out through the outlet. The frame has a cover which'provides a chamber inlet and a pump valve controlling passage from the inlet into-the pulsating chamber. The outlet check valve of the pulsating chamber is carried by the frame.

A further obj ect of the invention is to con; trol the liquid pum so that if pressure of liquid at the outlet 0 the pump exceeds a certain amount no more liquid will be delivered fromthe supply tank to the pump. In the present invention this is accomplished by providing the frame with a chamber connected with the pump outlet, and by locating in the chamber a movable element responsive to variations in liquid pressure and by providing a valve actuated by the movable element for preventing flow from the source of supply to the inlet check .valve of the pump while at the same time opening another valve which connects the pump outlet with the pump inlet check valve so that any liquid in the pump chamber may be circulated through the pulsating chamber. Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred form of embodiment of the present invention is clearly shown,

In the drawings:

Fig. 1 is an end elevation partly in section of an engine or .another machine having applied thereto a form of the present invention.

v Fig. 2 is a sectional view on line 2--2 of Fig. 4. I

Fig. 3 is a sectional view on line 3-3- of Fig. 2.

'33 which provides an extension of the pul- 48 against the seat 46. The outlet of cham- Fig. 4 is a sectional view on line4-4 of Fig. 7; f

Fig. 5 is a sectionalview on line 5.5 of Fig. l. t

Fig. 6 is abottom view on line 6-6 of Fig. 4.

- ig. 7 is a side elevation in the direction of the arrow 7 of Fig. 4 .and' arrow 7 of] Fig. l.

Fig. 8 is a sectional view on the line 8--8 of Fig.4. I

A machine frame, designated by numeral 20 in Fig. 1,' supports a driven shaft 21 carrying an eccentric 22 which cooperates with an eccentric strap 23 connected by an arm 24 with a pin 25 attached to a piston 26. The piston 26 .is made tubular for sake of lightness and is closed at its upper end'by plug 27. The parts .26 and 27 therefore constitute the reciprocating member of the pump which is guided by the cylindrical .wall'of a pulsating chamber 28 which is provided by the pump frame 29. The frame 29 is adapted to be secured to the machine frame 20 by screws 30. The chamber 28 isclosed by the piston elements 26 and 27 and also b a gasket 31 and a cover plate 32 attache to the frame 29 by screws 32. Cover 32 is provided with an arcuate groove sating chamber 28 when the cover is in position. Cover 32 includes a tube 84 having its lower end threaded at to receive a plug 36 for maintaining in position a cylindrical screen 37 which fits at its upper end over an annular boss 38.. The side wall of the. tube 34 is provided with a threaded opening" 39 for receivin a pipe leading from a source of li uid supp y. Y The annular boss 38 surroun s a passage 40 in alignment with a 5 passage. 41 of the same diameter in the frame 29. Passage 41 merges at a valve seat 42 into a smaller passage 41, and passage 41' merges into a still smaller passa e 43' extending through a valve seat 43. eferring more particularly to Fig. 2, the passsage 41-. in the frame 29.is connected by a transverse passage 44 with a passage 45 which is parallel to the passage 41*. As shown in Fig. 3, passage 45 communicates with the passage- 33 in the cover 32 through av valve seat member 46 carried by the cover 32. The passage in the valve seat 46' is normallyclosed by check valve 47 urged by spring.

2 to open.

ber ,33is through a ported valve seat 49 which is normally-closed by a check valve 50 which is urged against the seat '49 by a spring 51. The check valve 50 is housed within a valve cage 52 provided by the frame 29 and the cage 52 is connected by passage 53 with the fuel reservoir 54 which is provided by the frame 29, the reservoir 54 being closed by cover 55. Passages 56, 57 connectthe reservoir 54 with a threaded opening 58 for receiving a liquid outlet pipe.

W'ithin the reservoir 54there is located a I flexible metal bellows 60 having its upper end attached to the cover 55. The lower-end of the bellows is attached to. a valve stem 61 having a shank 62 which extends through the bottom wall of the bellows 60 and isriveted against a washer 63. The cover 55 carries a plug 64 having a tubular shank 65 which provides a stop limiting the upward movement of the washer 63. and which provides a guide for a spring 66 which is located between the head of the plug 64 and the bottom wall of the bellows 60. The plug 64 is provided with passages 67 and 68 which greater force downwardly than the spring 7 5 exerts upwardly so that normally the ,yalve 73 will be'inoved against its seat 43 and the,

valve 72 will be separated from its seat 42.

The downward movement of the piston 26 will tend to rarefy the air in the, pulsating chamber 28 thereby causing the check. valve 50 to remain closed and, the check'valve 47 Fuel will flow into the pulsating chamber 28 through inlet 39, tubular exten sion 34 of cover 32, screen 37, passage 40, passage 41, valve seat 42, passage 44, passage 45 and valve seat 46. The upward stroke of the piston 26 tends to compress the fluid in chamber 28 thereby causing the valve 50 to open and valve 47 to close. The liquid,

within the chambers 28 and 33 will be forced through the passages 52 and 53 into the reservoir 54and then out through liquid delivery passages 56. 57 and 58.

When the pressure of liquid in the reservoir 54 exceeds a certain amount the bellows 60 will be compressed upwardly sufiiciently to cause the valve 72 to engage its seat 42 and the valve 73 to be moved away from its seat 43. In this way the passage of liquid from the tube 34 into the passage 41 will be prevented, but the liquid may pass from the reservoir 54 into the passage 41 through the passage 43 in the valve seat 43. Therefore after valve 72 closes and the valve 73 opens, fluid in the reservoir 54 will be recirculated by the operation of the pulsating member 26.

The pump is particularly adapted for supplying liquid fuel to the carburetors of internal combustion engines. The liquid level of the carburetor is controlled by a float controlled valve in the bowl of the carburetor. When this valve closes, further operation of the fuel pump will cease. The valve 72 will be closed so that no more fuel will be delive ered to the pump until the carburetor float valve opens to permit more fuel to be de livered to the carburetor. The liquid pres: sure at which the valve 72 closes and valve 73 opens is controlled by turning the plug 64 so as to adjust the initial compression of the spring 66.

This pumping apparatus is particularly adapted to be attached to the crankcase of an internal combustion engine. The engaging walls of the piston 36 and chamber 28 are lubrica ted by the oil splashed in the crankcase of the engine. It is apparent from the drawings illustratingthe invention that the invention may be produced economically on account. of its simple construction and may be readily installed upon an internal combustion engine or other machines with which. the pump may cooperate.

While the form of embodiment of the present invention asherein disclosed, constitutes a preferred form, it is to be understood that other-form's might be adopted all coming within the scope of the claims which follow.

What is claimed is as follows:

1. liquid pump comprising, in combination, a frame adapted to be attached to a machine Which operates the pump and provid ing a pulsating chamber and a pump outlet, a. reciprocating pulsator within the chamber, a valve carried by the frame and controlling communication between the pulsating chamher and the pump outlet, a cover for the frame providing a pump inlet connected with the pulsating chamber, and a. pump valve controlling the passage from the inlet to the pulsating chamber.

2. Aliquid pump comprising, in combination, a frame adapted to be attached to a machine which operates the pump and providing a pulsating chamber and a pump outlet, and a reservoir connected with the pump .outlet, a reciprocating pulsator within the chamber, a valve'carried by the frame and controlling the passage from the chamber to the reservoir. a cover for the frame pro viding a pump inlet connected with the. pulsating chamber, a pump valve controlling the passage from the inlet to the pulsating chain-y her, and means responsive to pressure in the reservoir for closing communication between the pump inlet and inlet valve, and for open- 1,ea7,eee a ing a passage between the reservoi'r and pump inlet valve.

3. A pump structure adapted to mounted as a unit upon a machine frame and comprising, in combination, an inlet duct, an

outlet duct, a reservoir connected with the outlet duct, a pulsating chamber and reciprocating pulsator therein, and pressure re- HUGH WAILACE. 

